Re: Disassembly of the Z80 ROM of the C128

I know, that doesn't help explain that comment.

The phone conversation between bil and the wife of the CPM developer was 
definitely about the Z80 boot rom and not the BIOS as the BIOS in CPM is 
loaded from disk. The BIOS was the code that was hacked at CES to work 
round the 8563 bugs.


On 28/02/2017 12:32, Baltissen, GJPAA (Ruud) wrote:
>>> Not the ROM, but the BIOS.
>> What do you mean?
> The BIOS of CP/M is not the same thing as the BIOS of a PC. The BIOS is the first part of CP/M that is loaded from disk and that is (should be) the only part of CP/M that is machine independent. As soon the BIOS is loaded the ROM is removed from the memory range and replaced by RAM. So the most important (and last) task of the ROM of a CP/M computer is loading this BIOS.
>
> What IBM did was using the idea of a BIOS but implemented it in ROM and called this particular ROM the BIOS. So the BIOS of a PC and the BIOS of CP/M (should) do exactly the same but have been implemented in a different way.
>
>
> Met vriendelijke groet / With kind regards,
> Ruud Baltissen
>
> www.Baltissen.org
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